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diff --git a/gfx/angle/src/compiler/translator/EmulatePrecision.h b/gfx/angle/src/compiler/translator/EmulatePrecision.h
new file mode 100755
index 000000000..deb49cd2c
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+++ b/gfx/angle/src/compiler/translator/EmulatePrecision.h
@@ -0,0 +1,72 @@
+//
+// Copyright (c) 2002-2014 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#ifndef COMPILER_TRANSLATOR_EMULATE_PRECISION_H_
+#define COMPILER_TRANSLATOR_EMULATE_PRECISION_H_
+
+#include "common/angleutils.h"
+#include "compiler/translator/Compiler.h"
+#include "compiler/translator/InfoSink.h"
+#include "compiler/translator/IntermNode.h"
+#include "GLSLANG/ShaderLang.h"
+
+// This class gathers all compound assignments from the AST and can then write
+// the functions required for their precision emulation. This way there is no
+// need to write a huge number of variations of the emulated compound assignment
+// to every translated shader with emulation enabled.
+
+namespace sh
+{
+
+class EmulatePrecision : public TLValueTrackingTraverser
+{
+  public:
+    EmulatePrecision(const TSymbolTable &symbolTable, int shaderVersion);
+
+    void visitSymbol(TIntermSymbol *node) override;
+    bool visitBinary(Visit visit, TIntermBinary *node) override;
+    bool visitUnary(Visit visit, TIntermUnary *node) override;
+    bool visitAggregate(Visit visit, TIntermAggregate *node) override;
+    bool visitDeclaration(Visit visit, TIntermDeclaration *node) override;
+
+    void writeEmulationHelpers(TInfoSinkBase &sink,
+                               const int shaderVersion,
+                               const ShShaderOutput outputLanguage);
+
+    static bool SupportedInLanguage(const ShShaderOutput outputLanguage);
+
+  private:
+    struct TypePair
+    {
+        TypePair(const char *l, const char *r)
+            : lType(l), rType(r) { }
+
+        const char *lType;
+        const char *rType;
+    };
+
+    struct TypePairComparator
+    {
+        bool operator() (const TypePair& l, const TypePair& r) const
+        {
+            if (l.lType == r.lType)
+                return l.rType < r.rType;
+            return l.lType < r.lType;
+        }
+    };
+
+    typedef std::set<TypePair, TypePairComparator> EmulationSet;
+    EmulationSet mEmulateCompoundAdd;
+    EmulationSet mEmulateCompoundSub;
+    EmulationSet mEmulateCompoundMul;
+    EmulationSet mEmulateCompoundDiv;
+
+    bool mDeclaringVariables;
+};
+
+}  // namespace sh
+
+#endif  // COMPILER_TRANSLATOR_EMULATE_PRECISION_H_